Well as far as i know ares prices are going down. I saw rouge shell rebirth for as low as 650m. havnt seen warrior shell +7 yet on merchant but it will soon happen. scrolls are getting low too. So far i have seen 2k hp scrolls for 600m and 350 def for 550m.
The way i see it , IF the duping can be controled, then the prices will take a dramatic plunge. Eventually everyone will run out of gbs and start selling cheap.